Chapter 1

[TheRealRedd]

Hello

I made an and gate in HDL and i don't get any errors until the final output (when a =1, and b =1)
i get the error "Comparison Failure at Line 5", Here is my code:


CHIP And {
    IN a, b;
    OUT out;

    PARTS:
    Nand (a=a, b=b, out=aAndb);
}

please help,
Thanks

[cadet1620]

TheRealRedd wrote

    Nand (a=a, b=b, out=aAndb);

This makes an internal wire named "aAndB", but does not connect anything to the And chip's "out" pin.
That's why the And's out is always 0.

You might want to read the survival guide, particularly the "what's the meaning of a=a?" section.

--Mark

[TheRealRedd]

Thanks!